Vent for containers



Oct. 13, 1942.

c. B. GRIFFIN, JR., E-r AL VENT FOR CONTAINERS' Filed April 25, 1940 Pafettea foci. 13, 1942 UNITED STATES PATENT OFFICE'- 2,298,938 vEN'r Fon CONTAINERS Charles B. Griin, Jr., Lansdowne, Pa., and Adam F. Schuch, Wyandotte, Mich., assiguors to The Pennsylvania Salt Manufacturing Company,

Philadelphia, Pa., a corporation of Pennsylvania.

4' Claims.

'I'his invention relates to vents for containers for products from which gas tends to be liberated during shipping and storage and, particularly, to

inert to the gases emanating from the contents` stored in the vessel and which is so constructed that the gas-permeable medium may be readily removed and replaced when desired.

Another object of the invention is the provision of means for holding the gas-permeable medium in position in the vent Which'is so constructed that in clamping the holder in position the gas-permeable medium is likewise clamped in its position in the holder.

These and other objects we ,attain bytheconstruction shown in the' accompanying drawing wherein, for the purpose of illustration. we have shown a preferred embodiment of our inventionand wherein:

Fig. 1 is a vertical sectional view through a vent constructed in accordance with our invention;

Fig. 2 is a fragmentary perspective of the holder;

Fig. 3 is a perspective view of the able elementjand Fig. 4 is a vertical sectional View through a vent of slightly modified construction.

Referring now more particularly to the drawing, the numeral I generally designates the wall of a container having an opening Il formed therein. This opening is defined by a iiange I2 at present shown as attached to the Wall of the vessel by weldinggat I3. The flange I2'forms a portion of a vent casing, the remaining element of which comprises a cap I4 having a depending threaded flange I5 for engagement with threads formed on the exterior of ange I2. The interior of this cap has its upper wall slightly domed, as at I6, and is provided with a small eccentrically disposed vent opening I1. Within the vent casing a holder I8 is disposed, this holder comprising a tapered plug I9 having a. socket 20 gas-permeformed in its upper end and having its upper end portion defined by an outstanding flange. 2 I 'Ihe centrally located port 22 leads from the lower end of the plug to the lower end of the cavity or socket 20. The holder I3 is formed from a suitable resilient material which is'4 inert and impervious not only to the main contents of' lrhe container, but also to the gases emanating therefrom, rubber, synthetic rubber or a suitable plastic such as vinyl resin sold under the name of KorcseeL being satisfactory in the `majority of cases. Synthetic rubber is particularly sultable `for use in vents for hydrogen peroxide storagel vessels.

Within the socket 23 a plug of a gas-permeable or porous material 23 is disposed, the material utilized being inert to the contents of the container and gases liberated therefrom and, while permitting passage of gases, should be sub- 20' stant-ially impervious to the passage of liquid (in the event liquid is stored in the container). In the case of hydrogen peroxide, porous porcelains, carborundum, and alundum plugs have been found satisfactory. We, however, prefer to use a block of alundum, su-ch as so-ld under the name of Aloxite, for this purpose.

I n assembly, it is simply necessary to place the block in the socket, and after insertion of the holder I8 in a position to s`ecure the cap I4 down tightly the engagement of the outer portions of the upper wall of the cap with the iiange 2| will compress the same forming a satisfactory seal between the elements of the cap. At the-same time the compression of the anges will force *he material of the upper end of the plug inwardly so that the block 23 will be clamped in the socket and thus held against displacement by pressure. The doming of the upper portion of Ythe cap provides a chamber through which gases passing through the porous block 23 may reach the vent port II of the cap. Plug 23 simply forms a continuation of port 22 of the holder.

In the structure shown in Fig. 4, the construction above described is modified to the extent that a disc 24 is -placed over the upper end of the holder Ia t0 serve as a means forsecurely retaining the plug 23 in position. This disc may be, and preferably is of the same material as that employed in the construction of the holder. although it may, if so desired, be formed from aluminum or. other metals which will not be corrosively attacked by gases passing from the vessel.' This disc is provided with an opening 25 of less size than the plug and preferably eccentrithe container. As previously stated, the vent is particularly adapted :for use in connection with containers for hydrogen peroxide, but it may also be successfully used in containers for the shipment or storage of any chemical 'which tends to liberate gases, such as bleaching powders, calcium lhypochlorite, solid peroxides and solutions thereof. The member 23, hereinbefore referred to as a plug, may assume any desired form as regards its thickness or peripheral conformation.

Since the construction illustrated is capable of some modication without departing from the spirit of ourinvention, we do not wish to be understood as limiting ourselves thereto except as hereinafter claime l.

W e claim:

l. In apparatus for shipping or storing materials liberating gases, a container for the material having an opening defined by a vent casing provided with a vent port, a ported anged holder in the casing between the vent port and container and sealingly engaged with the casing walls, said holder being composed o material having the characteristics of live rubber and being substantially inert andv impermeable to both the material to be stored and to gases emanating therefrom, said vent porthaving an enlargement forming a socket and aporous plug tted inthe socket, said plug being composed of material substantially inert to both the material to be stored and the gases emanating therefrom but being permeable by the said gases, said casing being formed in a plurality of sections and said holder loosely ntting in one or' said sections with its flange interposed between opposed portions o the sections and having the flange thereof clamped between said sections, said socket being so disposed that the plug is substantially uniformly clamped in said socket by the compression of the flange of the holder.

2. In apparatus for shipping or storing materials liberating gases, a container for the material having an opening dened by a cylindrical vent casing provided with a vent port, a holder in the casing between the vent port and container and sealingly engaged with the casing walls, said holder having an axial port therethrough and being composed of material having the characteristics of live rubber and being substantially inert and impermeable to both the material to be stored and gases emanating therefrom, and a porous plug fitted in the upper portion of the port of the holder,` said plug being composed of material substantially inert to both the material to be stored and the gases emanating therefrom casing and clamped therebetween, said flange being disposed at the upper end of the holder body whereby compression of the flange causes clamping of the plug in the holder body,

3. In apparatus for shipping or storing materials liberating gases, a container for the material having an opening defined by a vent casing provided with a Vent port, a ported anged holder in the casing between the vent port and container andsealingly engaged with the casing walls, said holder being'composed o material having the characteristics of -live rubber and being substantially inert and impermeable to both the material to be stored and to gases emanating therefrom, a porous plug iitted in a socket forming a portion of the port of the holder, said plug being composed of material substantially inert to both the material to be stored and the gases emanating therefrombut being permeable by the said gases, said casing being formed in a plurality of sections and said holder loosely fitting in one oi said sections with its flange interposed between .opposed portions of the sections and having the flange thereof clamped between said sections, said socket being so disposed that the plug is clamped in Lsaid socket by the compression of the iiange of the holder, and a plate arranged between the outer element o f the casing and the holder and covering said socket and the plug arranged therein, said plate having an opening or" less size than the plug, the outer element of the casing being interiorly constructed to form a chamber placing the opening of said plate in communication with the vent.

Il'. In apparatus for shipping or storing materials liberating gases, a container for the matebut being permeable by said gases, said casing being formed in a 4plurality of sections and said holder comprising a body portion loosely iitting in one of said sections, and a ange interposed between opposed portions of the sections of the rial having an opening defined by a cylindrical vent casing provided with a vent port, a holder in the casing between the Vent port and container and sealingly engaged with the casina walls, said holder having an axial port therethrough and being composed of material having the characteristics of live rubber and being substantially inert and impermeable to both the material to be stored and gases emanating therefrom, and a porous plug tted in a socket in the upper portion of the port of the holder, said plug being composed of material substantially inert to both the material to be stored and the gases emanating therefrom but being permeable by said gases, said casing being formed in a plurality of sections and said holder comprising a body portion loosely fitting in one of said sections and a ange interposed between opposed portions of the sections of the casing and clamped therebetween, said flange being disposed at the upperend of the holder body whereby compression of the flange causes'clamping of the plug in the holder body, and a plate arranged between the Aouter element of the casing and the holder and 

